On the relevance of knowledge of Coran to assess Islam and its binary philosophy

Knowledge of Coran should not be mandatory to understand how Islam confront non-muslims, as this scriptures might be understood according to everyone's convenience.
When it calls for the killing of non-muslims, some will say it relates to one restricted historical context, while others would claim bluntly it defines the core of Djihad.

In some place Islam would be peaceful, while a few miles away it would be threatening. Soudan might be the perfect place to witness this.

For instance in Western Europe newly implanted Islam had been quiet and peaceful until it was not anymore.

There nowaday according to many observers like Pierre Cassen, a non-muslim would only neighbours that cult to experience a threat that stems from it.

Nevertheless non-muslims scattered among the western world are undertaking the painful task of investigating the boring Coran to voice their findings with contemporary tools.

Let us occidentals keep in mind USA the flagship country of the western world suffered on 9/11/2001 one of the numerous harsh blows inflicted in the name of Coran for centuries, joining the ever-expanding list of victims.

Then we might take no chance with Islam, answering in kind to any attack waged on non-muslim while staying prophylactic.

I am confident many non-muslims would think alike.

The spaniards, due to their proximity with the battlefield, had implemented a prophylaxy largely of their own against any islam spilling.

Every citizen would be a member of the parish's cofradìa or hermandad (spanish for brotherhood or fraternity) whose main purpose would be on several occasions a year to defile his statue carefully walked out of the church for a short time.

Seamingly, this is what it takes for the average citizen, beside supporting a credible navy, to keep Islam at bay while leaving 15 miles off its coast.